Optics and Spectroscopy, 2025 Volume 133, Issue 3,Pages 247–253(Mi os1606)
Proceedings of The XXVIII Annual International Conference "Saratov Fall Meeting 2024", September 23-27, 2024, Saratov, Russia. Advanced materials in optoelectronics, laser physics, and photonics Condensed matter spectroscopy
Temperature dependence of luminescence of terbium complexes with different substituents in N-heterocyclic ligands
Abstract:
The temperature dependence of the spectral luminescent characteristics of four terbium complexes with 2,2'-bipyridyldicarboxanilides, containing different substituents in phenyl ring, has been studied. The measurements were carried out in the temperature range from 302 to 329 K. The dependences of the luminescence quantum yield and integral intensity on temperature were obtained for the studied compounds. Asymmetry ratios were calculated. It was found that the quantum yield and integral luminescence intensity of the complexes decrease with increasing temperature, and the coefficients of temperature sensitivity of these characteristics were calculated. The maximum relative temperature sensitivity of the integral luminescence intensity was observed for the complex with a ligand without a substituent, it was (9.0 $\pm$ 1.0)%/K at a temperature of 309 K. Some of the studied complexes can potentially be used as optical thermometers.
Keywords:luminescence, terbium, REE complexes, temperature sensitivity, organic ligands, optical thermometer.
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